OpenAI: GPT-5.1-Codex-Mini

Public pricingIntelligence 81/100Large memory視覚深い思考ツール利用

OpenAI: GPT-5.1-Codex-Mini はマルチモーダルモデルで、コーディング、デバッグ、技術作業に向いています。マルチモーダル入力処理、高いコーディング性能、400K tokensのコンテキスト、低コストの特性を組み合わせ、coding, debugging, and technical writing で安定した動作を支えます。遅延・コスト・スループットが重要な場面に合っており、安定した出力、柔軟な導入、拡張性を求めるチームに実用的です。安定した応答、長い文脈処理、そして試作から本番まで広く使える柔軟さが必要な場面で役立ちます。安定した応答、長い文脈処理、そして試作から本番まで広く使える柔軟さが必要な場面で役立ちます。安定した応答、長い文脈処理、そして試作から本番まで広く使える柔軟さが必要な場面で役立ちます。

Input

$0.25/1M

Output

$2.00/1M

Cached

$0.03/1M

Batch

$0.13/1M

Calculate your GPT-5.1-Codex-Mini bill.

Set your workload — see cost at your exact volume.

What would GPT-5.1-Codex-Mini cost you?

Adjust the workload to see your monthly bill.

Conversations per month50,000

1,00010,00050,000250,0001M10M

Input length

Output length

Repeated questions?

Replies can wait a few hours (batch discount)

Technical specifications

GPT-5.1-Codex-Mini at a glance.

Memory

400,000

tokens

Max reply

128,000

tokens

Memory tier

Large

an entire book or large codebase

Tokenizer

tiktoken-o200k

Released

Nov 2025

Training cutoff

Jul 2025

Availability

Public pricing

Status

active

Benchmarks

Quality benchmarks

Independent evaluations from public leaderboards. Higher is better.

gpqa_diamond
81.3
humaneval
83.6
mmlu
82

What it can do

Capabilities & limits.

Understands images
Deep step-by-step thinking
Uses tools / calls functions
Strict JSON output
Streams replies
Fine-tunable on your data

When to pick GPT-5.1-Codex-Mini

Multi-step reasoning, research agents, or hard math.
Screenshot analysis, image understanding, or document OCR.
Agentic workflows that call tools or APIs.
Long documents, full codebases, or extensive chat histories.

When to look elsewhere

Very latency-sensitive, real-time apps where every millisecond counts.

Alternatives

Similar models to compare.

FAQ

GPT-5.1-Codex-Mini — the questions we see most.

Pricing, capabilities, alternatives — generated from the same data that powers the calculator above.

Get instant answers from our AI agent

At a typical workload of 50,000 conversations a month with 1,500-token prompts and 800-token replies, GPT-5.1-Codex-Mini costs roughly $99 per month. Input is $0.25 /1M tokens and output is $2.00 /1M tokens.

GPT-5.1-Codex-Mini has a 400,000-token context window (large memory — an entire book or large codebase). That means you can fit about 75,000 words of input and history in a single call.

Beyond text generation, GPT-5.1-Codex-Mini supports understanding images, deep step-by-step reasoning, calling functions / tools, strict JSON output, fine-tuning on your own data. It streams replies by default.

GPT-5.1-Codex-Mini was released in November 2025, with training data cut off around July 2025.

Models in a similar class include GPT-5 Mini, GPT-5.4 Nano, GPT-5 Nano. The "Similar models" section below this FAQ links into each.

Still unsure?

Compare GPT-5.1-Codex-Mini against 100+ other models.

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